// Copyright (c) 2022 Presto Labs Pte. Ltd.
// Author: fengyang

#pragma once

#include <algorithm>
#include <functional>
#include <map>
#include <string>
#include <vector>

#include "coin2/exchange/base/feed/processor.h"

namespace coin2::exchange::bybit::feed_v3 {
namespace impl {

using coin2::exchange::feed::WebsocketConfig;

class BybitRequestGenerator : public base::feed::RequestGenerator {
 public:
 explicit BybitRequestGenerator(const WebsocketConfig* ws_config)
      : config_(ws_config) {}

  std::vector<std::string> GenerateRequests(
      const std::vector<std::string>& channels,
      const std::vector<std::string>& symbols,
      const std::map<std::string, std::string>& channel_templates,
      const std::string& request_template) override {
    std::vector<std::string> reqs;
    std::vector<std::string> ch = channels;
    std::vector<std::string> ch_kline;
    auto iter = ch.begin();
    while (iter != ch.end()) {
      if (StringStartsWith(*iter, "kline_rest")) {
        ch_kline.push_back(*iter);
        iter = ch.erase(iter);
      } else {
        iter++;
      }
    }

    if (!ch_kline.empty()) {
      auto timestamp = MarketTimestampProvider::GetTimestamp();
      boost::posix_time::ptime round_time = TimestampRoundHour(timestamp);
      for (auto& ch_k : ch_kline) {
        std::string c = channel_templates.at(ch_k);
        auto interval_time = GetGranularity(c);
        for (auto& symbol : symbols) {
          std::vector<std::pair<int64_t, int64_t>> durations;
          bool long_query = base::feed::RequestGenerator::CheckLongQuery(
              round_time, symbol, ch_k, &last_long_query_time_);
          if (long_query) {
            durations = base::feed::RequestGenerator::GetDurations(
                config_->kline_length(), config_->kline_start(), config_->kline_end(),
                interval_time, 900);
          } else {
            // query small data
            durations = base::feed::RequestGenerator::GetDurations(
                "3", "", "",interval_time, 900);
          }
          int idx = 0;
          for (auto& d : durations) {
            std::string c_copy = c;
            boost::replace_all(c_copy, "{}", "301." + symbol);
            boost::replace_all(c_copy, "{end}", std::to_string(d.second / 1'000'000L));
            boost::replace_all(c_copy, "{start}", std::to_string(d.first / 1'000'000L));
            if (long_query) {
              c_copy.append("&page=").append(std::to_string(idx));
            }
            reqs.emplace_back(c_copy);
            idx++;
          }
        }
      }
    }

    if (!ch.empty()) {
      for (const auto& sym : symbols) {
        std::vector<std::string> channel_list;
        for (auto& channel : ch) {
          std::string c = channel_templates.at(channel);
          boost::replace_all(c, "{}", sym);
          channel_list.push_back(c);
        }

        std::string symbol_channels = boost::algorithm::join(channel_list, ",");
        std::string request = request_template;
        boost::replace_all(request, "{channel}", symbol_channels);
        reqs.push_back(request);
      }
    }

    return reqs;
  }
 private:
  int64_t GetGranularity(const std::string& channel) {
    if (channel.find("interval=1m") != std::string::npos) {
      return (int64_t)60 * 1'000'000'000;
    } else if (channel.find("interval=5m") != std::string::npos) {
      return (int64_t)5 * 60 * 1'000'000'000;
    } else if (channel.find("interval=15m") != std::string::npos) {
      return (int64_t)15 * 60 * 1'000'000'000;
    } else if (channel.find("interval=30m") != std::string::npos) {
      return (int64_t)30 * 60 * 1'000'000'000;
    } else if (channel.find("interval=1h") != std::string::npos) {
      return (int64_t)60 * 60 * 1'000'000'000;
    } else if (channel.find("interval=4h") != std::string::npos) {
      return (int64_t)4 * 60 * 60 * 1'000'000'000;
    } else if (channel.find("interval=1d") != std::string::npos) {
      return (int64_t)24 * 3600 * 1'000'000'000;
    } else if (channel.find("interval=1w") != std::string::npos) {
      return (int64_t)7* 24 * 3600 * 1'000'000'000;
    } else if (channel.find("interval=1M") != std::string::npos) {
      return (int64_t)28 * 24 * 3600 * 1'000'000'000;
    } else {
      THROW() << "Unkonw new channel: " << channel;
    }

    return std::numeric_limits<int64_t>::quiet_NaN();
  }

  const WebsocketConfig* config_;
};

}  // namespace impl
using impl::BybitRequestGenerator;
}  // namespace coin2::exchange::bybit::feed_v3
